[petsc-dev] -ksp_monitor and different norms

[Mark F. Adams]

On Oct 25, 2012, at 2:03 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> On Thu, Oct 25, 2012 at 12:52 PM, Mark F. Adams <mark.adams at columbia.edu> wrote:
> How should I go about getting -ksp_monitor to report the infinity norm?
> 
> Preconditioned or unpreconditioned residual?
> 
> You would use KSPMonitorSet(). This may be handy enough that PETSc should have -ksp_monitor_max.

OK, I'm going to start putting in -ksp_monitor_max, speak now or forever hold your peace.

> You can see the setup code in KSPSetFromOptions(). You could copy KSPMonitorTrueResidualNorm() or refactor so that both call a common helper that takes an additional argument (the norm type). Or put the norm type in the context data structure, I guess that's what it's there for, but then you need a destructor.

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